I've recently been trying to help a friend of mine with a strange problem that has developed on his laptop.
He can't browse the internet but he can use things such as MSN. Tried it with Internet Explorer and Firefox, both don't work.
Checked to make sure everything is on automatic for the DNS settings which it should be, and I checked the hosts file. His anti virus is out of date, not even sure what it is, and his firewall is on, I also don't think its blocking the browsers.
He's using the windows firewall, and well to be honest I'm out of ideas. Anyone got anything else that could be checked?
6th February 2005
It sounds like port 80 is blocked. The most likely culprit would be a firewall or security software running on his PC. After that I would look for a misconfigured router/NAT device or hardware firewall.
23rd October 2007
Can he ping websites? If so, then port 80 isn't blocked, if not, then I'd look into what Freyr said
6th February 2005
Ping doesn't use ports, it uses icmp packets so its only going to tell you if your physically connected to the target machine.
Hmmm, I'll look into Port 80 again. Although, just a list of any possibilities you happen to think of would be useful since then can just check them.
Okay for the record. I found out what the problem was. It was the ZoneAlarm Firewall.
It was that problem with one of the microsoft updates, which is now fixed in later ZoneAlarm versions.
Master of my own domain
18th July 2003
Let me guess. He attempted to download a windows update which triggered a false positive in ZA, and ZA was like 'RED ALERT RED ALERT PROGRAM IS USING OUTBOUND 80! BLOCK IT OFF."
How typical, but kind of funny in a twisted way.
(< my guitar) Gold Thread FTW
21st September 2007
in a twisted way yes, but it is the sort of thing that happens i have had it as well so it si proably quite common